<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }"
                >首页</el-breadcrumb-item
            >
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert
                title="添加商品信息"
                type="info"
                center
                show-icon
                :closable="false"
            >
            </el-alert>
            <!-- 步骤条区域 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- 表单区域 -->
            <el-form
                :model="addForm"
                :rules="addFormRules"
                ref="addFormRef"
                label-width="100px"
                label-position="top"
            >
                <!-- Tab栏区域 -->
                <el-tabs
                    v-model="activeIndex"
                    :tab-position="'left'"
                    :before-leave="beforeTabLeave"
                    @tab-click="tabClicked"
                >
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                expand-trigger="hover"
                                :options="catelist"
                                :props="cateProps"
                                v-model="addForm.goods_cat"
                                @change="handleChange"
                            ></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的Item项 -->
                        <el-form-item
                            :label="item.attr_name"
                            v-for="item in manyTableDate"
                            :key="item.attr_id"
                        >
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox
                                    :label="cb"
                                    v-for="(cb, i) in item.attr_vals"
                                    :key="i"
                                    border
                                ></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item
                            :label="item.attr_name"
                            v-for="item in onlyTableData"
                            :key="item.attr_id"
                        >
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action 表示图片要上传到的后台API地址 -->
                        <el-upload
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture"
                            :headers="headerObj"
                            :on-success="handleSuccess"
                        >
                            <el-button size="small" type="primary">点击上传</el-button>
                            <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- 添加商品的按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="600px"
        >
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
// lodash 引入
import _ from 'lodash'

export default {
    // 私有数据
    data() {
        return {
            // 步骤条
            activeIndex: '0',
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数组
                goods_cat: [],
                // 图片的数组
                pics: [],
                // 商品的详情描述
                goods_introduce: '',
                // 动态参数和静态属性的数组
                attrs: []
            },
            addFormRules: {
                goods_name: [
                    {
                        required: true, message: '请输入商品名称', trigger: 'blur'
                    }
                ],
                goods_price: [
                    {
                        required: true, message: '请输入商品价格', trigger: 'blur'
                    }
                ],
                goods_weight: [
                    {
                        required: true, message: '请输入商品重量', trigger: 'blur'
                    }
                ],
                goods_number: [
                    {
                        required: true, message: '请输入商品数量', trigger: 'blur'
                    }
                ],
                goods_cat: [
                    {
                        required: true, message: '请选择商品分类', trigger: 'blur'
                    }
                ]
            },
            // 商品分类列表
            catelist: [],
            cateProps: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            // 动态参数列表数据
            manyTableDate: [],
            // 静态属性列表数据
            onlyTableData: [],
            // 上传图片的URL地址
            uploadURL: 'https://www.liulongbin.top:8888/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            // 图片预览效果
            previewPath: '',
            previewVisible: false
        }
    },
    // 声明周期函数
    created() {
        this.getCateList()
    },
    // 事件处理函数
    methods: {
        // 获取所有商品分类数据
        async getCateList() {
            const { data: res } = await this.$http.get('categories')

            if (res.meta.status !== 200) {
                return this.$message.error('获取商品分类数据失败!')
            }

            this.catelist = res.data
            console.log(this.catelist)
        },
        // 级联选择器选中项变化，会触发这个函数
        handleChange() {
            // console.log(this.addForm.goods_cat)
            if (this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = []
                return this.$message.error('只能选择第三级分类哟!')
            }
        },
        // 监听Tab标签页切换
        beforeTabLeave(activeName, oldActiveName) {
            // console.log('即将离开的标签页名字是：' + oldActiveName)
            // console.log('即将进入的标签页名字是：' + activeName)
            // return false
            if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请先选择商品分类!')
                return false
            }
        },
        // 商品参数数据获取
        async tabClicked() {
            // console.log(this.activeIndex)
            // 证明访问的是动态参数面板
            if (this.activeIndex === '1') {
                // console.log('动态参数面板')
                if (this.activeIndex === '1') {
                    const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                        params: { sel: 'many' }
                    })

                    if (res.meta.status !== 200) {
                        return this.$message.error('获取动态参数列表失败!')
                    }

                    console.log(res.data)

                    res.data.forEach(item => {
                        item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
                    })

                    this.manyTableDate = res.data
                }
            } else if (this.activeIndex === '2') {
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: { sel: 'only' }
                })

                if (res.meta.status !== 200) {
                    return this.$message.error('获取静态属性失败!')
                }

                console.log(res.data)
                this.onlyTableData = res.data
            }
        },
        // 处理图片预览效果
        handlePreview(file) {
            console.log(file)
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file) {
            console.log(file)
            // 1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2.从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filePath)
            // 3.调用数组的splice方法，把图片信息对象，从pics数组移出
            this.addForm.pics.splice(i, 1)
            console.log(this.addForm)
        },
        // 监听图片上传成功的事件
        handleSuccess(response) {
            console.log(response)
            // 1.拼接得到一个图片信息对象
            const picInfo = { pic: response.data.tmp_path }
            // 2.将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm)
        },
        // 添加商品
        add() {
            // console.log(this.addForm)
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) {
                    return this.$message.error('请填写必要的表单项!')
                }
                // 执行添加的业务逻辑
                // lodash cloneDeep(obj)
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')

                // 处理动态参数
                this.manyTableDate.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo)
                })

                // 处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log(form)

                // 发起请求添加商品
                // 商品的名称，必须是唯一的
                const { data: res } = await this.$http.post('goods', form)

                if (res.meta.status !== 201) {
                    return this.$message.error('添加商品失败!')
                }

                this.$message.success('添加商品成功!')
                this.$router.push('/goods')
            })
        }
    },
    // 计算属性
    computed: {
        // 定义一个计算属性，商品参数获取
        cateId() {
            if (this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox {
    margin: 0 10px 0 0 !important;
}

.previewImg {
    width: 100%
}

.btnAdd {
    margin-top: 15px;
}
</style>